Transcript for How Miss South Texas Went From Overweight to Beauty Queen

We're talking about a girl who was bullied in grade school for weighing over 200 pounds. Wait until you see here now. She's actually a beauty queen with dreams of becoone day becoming miss America. Reporter: This is one of the outfits that won Kelly Crisco one of her crowns and sashes. But Crisco, the reigning miss south Texas, says she hasn't always looked like a beauty queen. Nine years ago, at just 14 years old, she tipped the scales, weighing around 230 pounds. I had a learning disability. And I just felt that I was inferior to others. I would really depend on food just to kind of comfort me. Reporter: Her aha moment, failing a physical fitness test in the eighth grade. I overheard some girls say, can you believe that the fat girl couldn't do any of it. Reporter: That's when she decided to change her life. I took a stand and said, you know, enough is enough. And I made a difference. Within a year and a half, she shed 70 pounds and has since lost another 30. Her new number on the scale, 129 pounds. Making small, implemental changes, eating less fried foods. Exercising down the road, about a year or so into my transformation. Reporter: Kryfko says she has cut out all carbohydrates. "Extreme weight loss'" Chris Powell, says she's following a winning formula. Everything that Keli did was textbook. And every step she took along the journey, it broke her free from the psychological chains and emotional eating. Reporter: Hoping to one day become miss America. She also hopes that her story will inspire others. I would just tell people that, you're not in prisoned by the current circumstances. You can be empowered by them. Reporter: For "Good morning America," Linzie Janis, ABC news, New York.

This transcript has been automatically generated and may not be 100% accurate.

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